In this paper, the friction and wear mechanisms of O-ring, commonly used sealing element of magnetorheological damper, were revealed, which has reference significance for seal design, fault diagnosis and life prediction of damper. A series of models of frictional force were established, through calculation and analysis, it was found that the piston rod velocity, particle size and particle mass fraction have certain rules that affect the friction coefficient and the film thickness. Subsequently, the friction and wear test bench of the sealing element of the magnetorheological damper was built, verifying the correctness of the theoretical model. In addition, through the observation of O-rings after the tests under different experimental conditions, the wear mechanism of O-ring is mainly abrasive wear.

揭示了磁流变阻尼器常用密封件O形圈的摩擦磨损机理，对阻尼器的密封设计，故障诊断和寿命预测具有参考意义。通过计算和分析，建立了一系列摩擦力模型，发现活塞杆的速度，粒径和质量分数具有一定的规律，影响着摩擦系数和膜厚。随后，建立了磁流变阻尼器密封件的摩擦磨损试验台，验证了理论模型的正确性。另外，通过在不同的实验条件下进行试验后观察O型圈，O型圈的磨损机理主要是磨料磨损。